双频带圆极化紧凑型微带贴片阵列天线设计

Compact dual-band circularly polarized microstrip patch array

利用旋转馈电方法设计双频带圆极化的微带贴片阵列天线。该阵列包括四个金属微带贴片单元与一个金属微带矩形环。每个贴片单元为侧边单点馈电的切角矩形,且关于中心旋转对称。矩形环被放置在阵列中心,与四个贴片单元通过四条微带线相连。该中心矩形环既充当了馈电网络,为阵列提供了产生圆极化波所需的递增相位,又参与了辐射,提高了阵列天线的辐射性能。由于采用了矩形环馈电贴片单元的方式,该阵列只需单层介质板,具有结构紧凑的优点,而且在两个频段内实现了圆极化辐射。经加工、制作并进行测试,该阵列的-10 d B阻抗带宽分别为5.17 GHz^5.59 GHz和5.99 GHz^6.27 GHz,3 d B轴比带宽分别为5.19 GHz^5.49 GHz和6.1 GHz^6.18 GHz。

A dual-band circularly polarized patch array using a sequential-phase feeding network was presented. The array includes four metal patches and a metal square ring. Each rectangle patch was cut in diagonal comers, and was excited by feeding lines on the edge. The feeding lines are microstrip which are connected to the middle metal square ring. In addition, four patches are rotated arrangement. The middle mental square ring is not only a feeding network which provides increasing phase for circularly polarization, but also a radiator which enhances the performance of the array. With this feeding way, the patch array just has single-layer substrate and it is compact. In addition, it radiates circularly polarized patterns in two working bands. Through fabrication, test and measurement, the - 10 dB impedance bandwidth of the patch array is 5. 17 GHz - 5. 59 GHz and 5. 99 GHz -6. 27 GHz. The measured 3 dB AR bandwidth is 5. 19 GHz -5. 49 GHz and 6. 1 GHz -6. 18 GHz.